Bio-Activ Live Natural Black Live Cichlid Sand 20LBS (Grain size: 1.2 -1.7mm)Provides Rift Lake environment perfect for African Cichlid. Use them in your aquariums and ponds to make the floor bottom look great. It provides living space for beneficial microbes and anchoring for plants. It also helps with the filtering process of the water in your aquarium tank or pond by increasing the surface area available for nitrifying bacteria to colonize.

Onyx Sand, 7 kg / 15.4 lbs

Onyx Sand is a specially fracted, stable porous gravel for the natural planted aquarium. Being carbonate rich, Onyx Sand provides an advantage to any plants able to utilize bicarbonates. Although ideally suited to planted aquaria, it may be used in any aquarium environment. Onyx Sand is most effective when used alone as an integral substrate bed, but it may be mixed with other gravels. Gravel modifiers such as laterite are not necessary. Onyx Sand is not chemically coated or treated but does have a slight buffering capacity that may raise pH by 0.1 - 0.5 pH units (depending on source water characteristics).

Carib Sea ACS00020 Aragonite Reef Sand for Aquarium, 15-Pound

Donâ€™t settle for an ordinary gravel. Natural dramatic colors and textures combined with pH support characterize our Coraline and Seafloor products. These are coarser materials suitable for most under gravel filtration and fish systems or as an accent for finer sands anywhere where elevated pH values are desirable. Consider the Coraline products in brackish or Cichlid aquariums (Central American or African). Seafloor Puka Shell substrates are great additions to fine sands in reef tanks where animals make their homes by burrowing in the substrate. Jaw fish, blennies and burrowing crustaceans will especially appreciate the extra â€œconstruction material.â€ Our substrates are purposely engineered and free of impurities such as ash, metals, pesticides, and silica; which allows you to create a safe and beautiful environment for your fish and invertebrates. Precision grading makes system design a breeze! No matter what type of system you are setting up, we have the substrate thatâ€™s perfect for the filtration method and habitat you are creating.